from math import sqrt
x1, y1, x2, y2 = map(float, input().split())
r = sqrt((x1 - x2)**2 + (y1 - y2)**2 )
print('{0:.5f}'.format(r)) from math import sqrt x1, y1, x2, y2 = map(float, input().split()) x1 map(float, input().split()) map float input().split() ().split () input split y1 x2 y2 r = sqrt((x1 - x2)**2 + (y1 - y2)**2 ) r sqrt((x1 - x2)**2 + (y1 - y2)**2 ) sqrt (x1 - x2)**2 + (y1 - y2)**2 (x1 - x2)**2 x1 - x2 x1 x2 2 (y1 - y2)**2 y1 - y2 y1 y2 2 print('{0:.5f}'.format(r)) print '{0:.5f}'.format(r) '{0:.5f}'.format '{0:.5f}' format r x1, y1, x2, y2 = map(float, input().split()) map(float, input().split()) x1 x2, y2 = map(float, input().split()) map(float, input().split()) x2 y2 = map(float, input().split()) map(float, input().split()) y2 y1, x2, y2 = map(float, input().split()) map(float, input().split()) y1 r = sqrt((x1 - x2)**2 + (y1 - y2)**2 ) sqrt((x1 - x2)**2 + (y1 - y2)**2 ) r
from math import sqrt
x1, y1, x2, y2 = map(float, input().split())
r = sqrt((x1 - x2)**2 + (y1 - y2)**2 )
print('{0:.5f}'.format(r))
